---
type: "resource-definitions"
title: "SubscriptionTopic Definitions"
resource: "SubscriptionTopic"
---

# SubscriptionTopic Definitions

<a id="SubscriptionTopic"></a>

## SubscriptionTopic
The definition of a specific topic for triggering events within the Subscriptions framework

**Definition:** Describes a stream of resource state changes or events and annotated with labels useful to filter projections from this topic.

**Cardinality:** 0..*

**Mappings:** workflow=Definition; rim=Act[moodCode<=DEFN]; w5=infrastructure.exchange


<a id="SubscriptionTopic.url"></a>

## SubscriptionTopic.url
Canonical identifier for this subscription topic, represented as an absolute URI (globally unique)

**Definition:** An absolute URI that is used to identify this subscription topic when it is referenced in a specification, model, design or an instance; also called its canonical identifier. This SHOULD be globally unique and SHOULD be a literal address at which an authoritative instance of this subscription topic is (or will be) published. This URL can be the target of a canonical reference. It SHALL remain the same when the subscription topic is stored on different servers.

**Comments:** Can be a `urn:uuid:` or a `urn:oid:` but real `http/s:` addresses are preferred.  Multiple instances may share the same URL if they have a distinct version.

The determination of when to create a new version of a resource (same url, new version) vs. defining a new artifact is up to the author.  Considerations for making this decision are found in [Technical and Business Versions](resource.html#versions).

In some cases, the resource can no longer be found at the stated url, but the url itself cannot change. Implementations can use the [meta.source](resource.html#meta) element to indicate where the current master source of the resource can be found.

When this is a locally defined topic or derived from a topic defined in the FHIR spec or an IG, this uniquely identifies the topic and functionality. Ideally this URL resolves to documentation about the use cases.

When this is a topic derived from another topic (e.g., it adds additional filters or functionality to a topic defined in an IG), then this URL should be different than the base and the `derivedFromCanonical` should be filled out with the unique uri as defined in the IG.

When this is a direct implementation from another IG or registered topic (with no additional filters, etc., so not derived), then this url is the unique url for this topic as defined by the IG.

**Requirements:** Allows the subscription topic to be referenced by a single globally unique identifier.

**Cardinality:** 1..1

**Type:** [uri](/uri)

**Summary:** true

**Mappings:** workflow=Definition.url; w5=FiveWs.identifier; rim=.identifier


<a id="SubscriptionTopic.identifier"></a>

## SubscriptionTopic.identifier
Business identifier for subscription topic

**Definition:** Business identifiers assigned to this subscription topic by the performer and/or other systems.  These identifiers remain constant as the resource is updated and propagates from server to server.

**Comments:** Note: This is a business identifier, not a resource identifier (see [discussion](resource.html#identifiers)).  It is best practice for the identifier to only appear on a single resource instance, however business practices may occasionally dictate that multiple resource instances with the same identifier can exist - possibly even with different resource types.  For example, multiple Patient and a Person resource instance might share the same social insurance number.

**Requirements:** Allows identification of the subscription topic as it is known by various participating systems and in a way that remains consistent across servers.

**Cardinality:** 0..*

**Type:** [Identifier](/Identifier)

**Summary:** true

**Mappings:** workflow=Definition.identifier; w5=FiveWs.identifier; rim=.identifier


<a id="SubscriptionTopic.version"></a>

## SubscriptionTopic.version
Business version of the subscription topic

**Definition:** The identifier that is used to identify this version of the subscription topic when it is referenced in a specification, model, design or instance. This is an arbitrary value managed by the Topic author and is not expected to be globally unique. For example, it might be a timestamp (e.g. yyyymmdd) if a managed version is not available. There is also no expectation that versions are orderable.

**Comments:** There may be multiple different instances of a subscription topic that have the same identifier but different versions.

**Cardinality:** 0..1

**Type:** [string](/string)

**Summary:** true

**Mappings:** workflow=Definition.version; w5=FiveWs.version; rim=N/A (to add?)


<a id="SubscriptionTopic.versionAlgorithm[x]"></a>

## SubscriptionTopic.versionAlgorithm[x]
How to compare versions

**Definition:** Indicates the mechanism used to compare versions to determine which is more current.

**Comments:** If set as a string, this is a FHIRPath expression that has two additional context variables passed in - %version1 and %version2 and will return a negative number if version1 is newer, a positive number if version2 and a 0 if the version ordering can't be successfully be determined.

**Cardinality:** 0..1

**Type:** [string](/string), [Coding](/Coding)

**Binding:** extensible:[version-algorithm](/valueset-version-algorithm)

**Summary:** true

**Mappings:** workflow=Definition.versionAlgorithm


<a id="SubscriptionTopic.name"></a>

## SubscriptionTopic.name
Name for this subscription topic (computer friendly)

**Definition:** A natural language name identifying the subscription topic This name should be usable as an identifier for the module by machine processing applications such as code generation.

**Comments:** The name is not expected to be globally unique. The name should be a simple alphanumeric type name to ensure that it is machine-processing friendly.

**Requirements:** Support human navigation and code generation.

**Cardinality:** 0..1

**Type:** [string](/string)

**Summary:** true

**Mappings:** workflow=Definition.name


<a id="SubscriptionTopic.title"></a>

## SubscriptionTopic.title
Name for this subscription topic (human friendly)

**Definition:** A short, descriptive, user-friendly title for the subscription topic.  For example, "admission".

**Comments:** This name does not need to be machine-processing friendly and may contain punctuation, white-space, etc.

**Aliases:** Name, SubscriptionTopic Name

**Cardinality:** 0..1

**Type:** [string](/string)

**Summary:** true

**Mappings:** workflow=Definition.title; rim=.title


<a id="SubscriptionTopic.derivedFrom"></a>

## SubscriptionTopic.derivedFrom
Based on FHIR protocol or definition

**Definition:** The canonical URL pointing to another FHIR-defined SubscriptionTopic that is adhered to in whole or in part by this SubscriptionTopic.

**Requirements:** SubscriptionTopics may be refinements of more generic topics.

**Cardinality:** 0..*

**Type:** [canonical](/canonical)

**Summary:** true

**Mappings:** workflow=Definition.derivedFromCanonical; v2=Varies by domain; rim=.outboundRelationship[typeCode=DEFN].target


<a id="SubscriptionTopic.status"></a>

## SubscriptionTopic.status
draft | active | retired | unknown

**Definition:** The current state of the SubscriptionTopic.

**Comments:** A nominal state-transition diagram can be found in the [Definition pattern](definition.html#statemachine) documentation

Unknown does not represent "other" - one of the defined statuses must apply.  Unknown is used when the authoring system is not sure what the current status is.

See guidance around (not) making local changes to elements [here](canonicalresource.html#localization).

**Cardinality:** 1..1

**Type:** [code](/code)

**Binding:** required:[publication-status](/valueset-publication-status)

**Summary:** true

**Is Modifier:** true (Reason: This is labeled as "Is Modifier" because applications should not use a retired SubscriptionTopic without due consideration)

**Mappings:** workflow=Definition.status; w5=FiveWs.status; rim=.status


<a id="SubscriptionTopic.experimental"></a>

## SubscriptionTopic.experimental
If For testing only - never for real usage

**Definition:** A flag to indicate that this TopSubscriptionTopicic is authored for testing purposes (or education/evaluation/marketing), and is not intended to be used for genuine usage.

**Comments:** Allows filtering of SubscriptionTopic that are appropriate for use vs. not. Experimental resources might include example instances in implementation guides, instances created solely for testing purposes, etc. If experimental is 'true' for any version of a resource, it should be true for all versions of the resource.  (If experimental changes, then it is being misused or a resource that was never intended for real-world use has unexpectedly changed its purpose.).

Experimental resources are not expected to be stable and may well have breaking changes without a corresponding change to the 'version' element.

**Requirements:** Enables experimental content to be developed following the same life-cycle as a production-level SubscriptionTopic would.

**Meaning if Missing:** If absent, this resource is treated as though it is not experimental.

**Cardinality:** 0..1

**Type:** [boolean](/boolean)

**Summary:** true

**Mappings:** workflow=Definition.experimental; w5=FiveWs.class; rim=N/A (to add?)


<a id="SubscriptionTopic.date"></a>

## SubscriptionTopic.date
Date status first applied

**Definition:** The date (and optionally time) when the subscription topic was last significantly changed. The date must change when the business version changes and it must change if the status code changes. In addition, it should change when the substantive content of the subscription topic changes.

**Comments:** See guidance around (not) making local changes to elements [here](canonicalresource.html#localization).

**Aliases:** created

**Cardinality:** 0..1

**Type:** [dateTime](/dateTime)

**Summary:** true

**Mappings:** workflow=Definition.date; w5=FiveWs.recorded; rim=.participation[typeCode=AUT].time


<a id="SubscriptionTopic.publisher"></a>

## SubscriptionTopic.publisher
The name of the individual or organization that published the SubscriptionTopic

**Definition:** Helps establish the "authority/credibility" of the SubscriptionTopic.  May also allow for contact.

**Requirements:** Usually an organization, but may be an individual. The publisher (or steward) of the SubscriptionTopic is the organization or individual primarily responsible for the maintenance and upkeep of the Topic. This is not necessarily the same individual or organization that developed and initially authored the content. The publisher is the primary point of contact for questions or issues with the Topic. This item SHOULD be populated unless the information is available from context.

**Aliases:** author

**Cardinality:** 0..1

**Type:** [string](/string)

**Summary:** true

**Mappings:** workflow=Definition.publisher {as string instead of CodeableConcept}; w5=FiveWs.author; rim=.participation[typeCode=AUT].role


<a id="SubscriptionTopic.contact"></a>

## SubscriptionTopic.contact
Contact details for the publisher

**Definition:** Contact details to assist a user in finding and communicating with the publisher.

**Comments:** May be a web site, an email address, a telephone number, etc.

See guidance around (not) making local changes to elements [here](canonicalresource.html#localization).

**Cardinality:** 0..*

**Type:** [ContactDetail](/ContactDetail)

**Summary:** true

**Mappings:** workflow=Definition.contact; rim=.participation[typeCode=CALLBCK].role


<a id="SubscriptionTopic.description"></a>

## SubscriptionTopic.description
Natural language description of the SubscriptionTopic

**Definition:** A free text natural language description of the Topic from the consumer's perspective.

**Comments:** This description can be used to capture details such as comments about misuse, instructions for clinical use and interpretation, literature references, examples from the paper world, etc. It is not a rendering of the module as conveyed in the text field of the resource itself. This item SHOULD be populated unless the information is available from context.

**Cardinality:** 0..1

**Type:** [markdown](/markdown)

**Mappings:** workflow=Definition.description; rim=.text


<a id="SubscriptionTopic.useContext"></a>

## SubscriptionTopic.useContext
Content intends to support these contexts

**Definition:** The content was developed with a focus and intent of supporting the contexts that are listed. These terms may be used to assist with indexing and searching of code system definitions.

**Comments:** When multiple usageContexts are specified, there is no expectation for whether all or any of the contexts apply.

**Requirements:** Assist in searching for appropriate content.

**Cardinality:** 0..*

**Type:** [UsageContext](/UsageContext)

**Summary:** true

**Mappings:** workflow=Definition.useContext; rim=N/A (to add?)


<a id="SubscriptionTopic.jurisdiction"></a>

## SubscriptionTopic.jurisdiction
Intended jurisdiction of the SubscriptionTopic (if applicable)

**Definition:** A jurisdiction in which the Topic is intended to be used.

**Comments:** DEPRECATION NOTE: For consistency, implementations are encouraged to migrate to using the new 'jurisdiction' code in the useContext element.  (I.e. useContext.code indicating http://terminology.hl7.org/CodeSystem/usage-context-type#jurisdiction and useContext.valueCodeableConcept indicating the jurisdiction.)

**Cardinality:** 0..*

**Type:** [CodeableConcept](/CodeableConcept)

**Binding:** extensible:[jurisdiction](/valueset-jurisdiction)

**Summary:** true

**Mappings:** workflow=Definition.jurisdiction; rim=N/A (to add?)


<a id="SubscriptionTopic.purpose"></a>

## SubscriptionTopic.purpose
Why this SubscriptionTopic is defined

**Definition:** Explains why this Topic is needed and why it has been designed as it has.

**Comments:** This element does not describe the usage of the Topic.  Rather it is for traceability of ''why'' the resource is either needed or ''why'' it is defined as it is.  This may be used to point to source materials or specifications that drove the structure of this Topic.

**Cardinality:** 0..1

**Type:** [markdown](/markdown)

**Mappings:** workflow=Definition.purpose; w5=FiveWs.why[x]; rim=.reasonCode.text


<a id="SubscriptionTopic.copyright"></a>

## SubscriptionTopic.copyright
Notice about intellectual property ownership, can include restrictions on use

**Definition:** A copyright statement relating to the SubscriptionTopic and/or its contents. Copyright statements are notices of intellectual property ownership and can include restrictions on the use and publishing of the SubscriptionTopic.

**Comments:** ...

**Requirements:** Consumers of the TSubscriptionTopicopic must be able to determine any legal restrictions on the use of the artifact and/or its content.

**Aliases:** License, Restrictions

**Cardinality:** 0..1

**Type:** [markdown](/markdown)

**Mappings:** workflow=Definition.copyright; rim=N/A (to add?)


<a id="SubscriptionTopic.copyrightLabel"></a>

## SubscriptionTopic.copyrightLabel
Copyright holder and year(s)

**Definition:** A short string (<50 characters), suitable for inclusion in a page footer that identifies the copyright holder, effective period, and optionally whether rights are restricted. (e.g. 'All rights reserved', 'Some rights reserved').

**Comments:** The copyright symbol and the '(c)' textual representation SHOULD NOT be included in this string. It will be added by software when rendering the notation. Full details about licensing, restrictions, warrantees, etc. goes in the more general 'copyright' element.

**Requirements:** Defines the content expected to be rendered in all representations of the artifact.

**Cardinality:** 0..1

**Type:** [string](/string)


<a id="SubscriptionTopic.approvalDate"></a>

## SubscriptionTopic.approvalDate
When SubscriptionTopic is/was approved by publisher

**Definition:** The date on which the asset content was approved by the publisher. Approval happens once when the content is officially approved for usage.

**Comments:** The date may be more recent than the approval date because of minor changes / editorial corrections.

**Cardinality:** 0..1

**Type:** [date](/date)

**Mappings:** workflow=Definition.approvalDate; rim=.outboundRelationship[typeCode="SUBJ"].act[classCode=CACT;moodCode=EVN;code="approval"].effectiveTime


<a id="SubscriptionTopic.lastReviewDate"></a>

## SubscriptionTopic.lastReviewDate
Date the Subscription Topic was last reviewed by the publisher

**Definition:** The date on which the asset content was last reviewed. Review happens periodically after that, but doesn't change the original approval date.

**Comments:** If specified, this is usually after the approval date.

**Cardinality:** 0..1

**Type:** [date](/date)

**Mappings:** workflow=Definition.lastReviewDate; rim=.outboundRelationship[typeCode="SUBJ"; subsetCode="RECENT"].act[classCode=CACT;moodCode=EVN;code="review"].effectiveTime


<a id="SubscriptionTopic.effectivePeriod"></a>

## SubscriptionTopic.effectivePeriod
The effective date range for the SubscriptionTopic

**Definition:** The period during which the SubscriptionTopic content was or is planned to be effective.

**Comments:** The effective period for a SubscriptionTopic  determines when the content is applicable for usage and is independent of publication and review dates. For example, a measure intended to be used for the year 2016 would be published in 2015.

**Cardinality:** 0..1

**Type:** [Period](/Period)

**Summary:** true

**Mappings:** workflow=Definition.effectivePeriod; rim=N/A (to add?)


<a id="SubscriptionTopic.trigger"></a>

## SubscriptionTopic.trigger
Definition of a trigger for the subscription topic

**Definition:** A definition of a state change or event that triggers a notification based on the SubscriptionTopic. The criteria may be just a human readable description, or may contain a FHIRPath expression, query-based definition, or event coding. Multiple triggers are considered OR joined (e.g., an update matching ANY of the definitions will trigger a notification).

**Cardinality:** 0..*

**Type:** [BackboneElement](/BackboneElement)

**Summary:** true

**Mappings:** rim=N/A (to add?)


<a id="SubscriptionTopic.trigger.description"></a>

## SubscriptionTopic.trigger.description
Text representation of the resource trigger

**Definition:** The human readable description of this trigger for the SubscriptionTopic -  for example, "An Encounter enters the 'in-progress' state".

**Comments:** Implementation of particular subscription topics might not use a computable definition and instead base their design on the definition.

**Cardinality:** 0..1

**Type:** [markdown](/markdown)

**Summary:** true


<a id="SubscriptionTopic.trigger.resource"></a>

## SubscriptionTopic.trigger.resource
Key Data Type, Resource (reference to definition), or relevant definition for this trigger

**Definition:** URL of the key definition that is relevant to this trigger.  Relative URLs are relative to the StructureDefinition root of the implemented FHIR version (e.g., http://hl7.org/fhir/StructureDefinition). For example, "Patient" maps to http://hl7.org/fhir/StructureDefinition/Patient.  For more information, see <a href="elementdefinition-definitions.html#ElementDefinition.type.code">ElementDefinition.type.code</a>.

**Comments:** Note that a query-based definition can only be applied if the `resource` is set to a FHIR resource. FHIRPath and event-based definitions have more flexibility outside of FHIR.

**Cardinality:** 1..1

**Type:** [uri](/uri)

**Binding:** extensible:[subscription-types](/valueset-subscription-types)

**Summary:** true


<a id="SubscriptionTopic.trigger.supportedInteraction"></a>

## SubscriptionTopic.trigger.supportedInteraction
create | update | delete

**Definition:** The FHIR RESTful interaction which can be used to trigger a notification for the SubscriptionTopic. Multiple values are considered OR joined (e.g., CREATE or UPDATE). If not present, all supported interactions are assumed.

**Cardinality:** 0..*

**Type:** [code](/code)

**Binding:** required:[interaction-trigger](/valueset-interaction-trigger)

**Summary:** true


<a id="SubscriptionTopic.trigger.queryCriteria"></a>

## SubscriptionTopic.trigger.queryCriteria
Query based trigger rule

**Definition:** The FHIR query based rules that the server should use to determine when to trigger a notification for this subscription topic.

**Comments:** For additional information about query criteria and their application, please see [Query Trigger Definitions](subscriptiontopic.html#query-criteria).

**Cardinality:** 0..1

**Type:** [BackboneElement](/BackboneElement)

**Summary:** true


<a id="SubscriptionTopic.trigger.queryCriteria.previous"></a>

## SubscriptionTopic.trigger.queryCriteria.previous
Rule applied to previous resource state

**Definition:** The FHIR query based rules are applied to the previous resource state (e.g., state before an update).

**Comments:** The rules are search criteria (without the [base] part). Like `Bundle.entry.request.url`, it has no leading slash character (`/`).

**Cardinality:** 0..1

**Type:** [string](/string)

**Summary:** true


<a id="SubscriptionTopic.trigger.queryCriteria.resultForCreate"></a>

## SubscriptionTopic.trigger.queryCriteria.resultForCreate
test-passes | test-fails

**Definition:** For `create` interactions, should the `previous` criteria count as an automatic pass or an automatic fail. If not present, the testing behavior during `create` interactions is unspecified (server discretion).

**Cardinality:** 0..1

**Type:** [code](/code)

**Binding:** required:[subscriptiontopic-cr-behavior](/valueset-subscriptiontopic-cr-behavior)

**Summary:** true


<a id="SubscriptionTopic.trigger.queryCriteria.current"></a>

## SubscriptionTopic.trigger.queryCriteria.current
Rule applied to current resource state

**Definition:** The FHIR query based rules are applied to the current resource state (e.g., state after an update).

**Comments:** The rules are search criteria (without the [base] part). Like Bundle.entry.request.url, it has no leading slash character (`/`).

**Cardinality:** 0..1

**Type:** [string](/string)

**Summary:** true


<a id="SubscriptionTopic.trigger.queryCriteria.resultForDelete"></a>

## SubscriptionTopic.trigger.queryCriteria.resultForDelete
test-passes | test-fails

**Definition:** For 'delete' interactions, should the 'current' query criteria count as an automatic pass or an automatic fail. If not present, the testing behavior during `delete` interactions is unspecified (server discretion).

**Cardinality:** 0..1

**Type:** [code](/code)

**Binding:** required:[subscriptiontopic-cr-behavior](/valueset-subscriptiontopic-cr-behavior)

**Summary:** true


<a id="SubscriptionTopic.trigger.queryCriteria.requireBoth"></a>

## SubscriptionTopic.trigger.queryCriteria.requireBoth
Both must be true flag

**Definition:** If set to `true`, both the `current` and `previous` query criteria must evaluate `true` to trigger a notification for this topic.  If set to `false` or not present, a notification for this topic will be triggered if either the `current` or `previous` tests evaluate to `true`.

**Comments:** Please note the interaction between this element and the `resultForCreate`/`resultForDelete` elements during `create` and `delete` interactions.  For example, if `resultForCreate` is set to `test-passes`, setting `requireBoth` to `false` means that every `create` will trigger a notification while setting `requireBoth` to `true` will result in notifications if the `current` test passes.  Similarly, if `resultForCreate` is set to `test-fails`, setting `requireBoth` to `true` means that no `create` will be able to generate a notification while setting `requireBoth` to `false` will result in notifications if the `current` test passes.

**Cardinality:** 0..1

**Type:** [boolean](/boolean)

**Summary:** true


<a id="SubscriptionTopic.trigger.fhirPathCriteria"></a>

## SubscriptionTopic.trigger.fhirPathCriteria
FHIRPath based trigger rule

**Definition:** The FHIRPath based rules that the server should use to determine when to trigger a notification for this topic.

**Comments:** FHIRPath expression with %previous and %current vars.

**Cardinality:** 0..1

**Type:** [string](/string)

**Summary:** true


<a id="SubscriptionTopic.trigger.event"></a>

## SubscriptionTopic.trigger.event
Event which can trigger a notification from the SubscriptionTopic

**Definition:** A well-defined event which can be used to trigger notifications from the SubscriptionTopic.

**Cardinality:** 0..1

**Type:** [CodeableConcept](/CodeableConcept)

**Binding:** example:[v2-0003](/valueset-v2-0003)

**Summary:** true


<a id="SubscriptionTopic.trigger.canFilterBy"></a>

## SubscriptionTopic.trigger.canFilterBy
Properties by which a Subscription can filter notifications based on this trigger

**Definition:** List of properties by which Subscriptions can be filtered. May be defined Search Parameters (e.g., Encounter.patient) or parameters defined within this SubscriptionTopic context (e.g., hub.event).

**Cardinality:** 0..*

**Type:** [BackboneElement](/BackboneElement)

**Summary:** true


<a id="SubscriptionTopic.trigger.canFilterBy.description"></a>

## SubscriptionTopic.trigger.canFilterBy.description
Description of this filter parameter

**Definition:** Description of how this filtering parameter is intended to be used.

**Cardinality:** 0..1

**Type:** [markdown](/markdown)

**Summary:** true


<a id="SubscriptionTopic.trigger.canFilterBy.resource"></a>

## SubscriptionTopic.trigger.canFilterBy.resource
URL of the triggering Resource that this filter applies to

**Definition:** URL of the Resource that is the type used in this filter. This is the "focus" of the topic (or one of them if there are more than one). It will be the same, a generality, or a specificity of the `SubscriptionTopic.trigger.resource` if this is present.

**Comments:** URL of the Resource that is the type used in this filter. Relative URLs are relative to the `StructureDefinition` root of the implemented FHIR version (e.g., http://hl7.org/fhir/StructureDefinition). For example, "Patient" maps to http://hl7.org/fhir/StructureDefinition/Patient. For more information, see <a href="elementdefinition-definitions.html#ElementDefinition.type.code">ElementDefinition.type.code</a>.

**Cardinality:** 0..1

**Type:** [uri](/uri)

**Binding:** extensible:[subscription-types](/valueset-subscription-types)

**Summary:** true


<a id="SubscriptionTopic.trigger.canFilterBy.filterParameter"></a>

## SubscriptionTopic.trigger.canFilterBy.filterParameter
Human-readable and computation-friendly name for a filter parameter usable by subscriptions on this topic, via Subscription.filterBy.filterParameter

**Definition:** Either the canonical URL to a search parameter (like "http://hl7.org/fhir/SearchParameter/encounter-patient") or topic-defined parameter (like "hub.event") which is a label for the filter.

**Comments:** Chained parameters are allowed (like "patient.gender") - but can not use colons or modifiers.

**Cardinality:** 1..1

**Type:** [string](/string)

**Summary:** true


<a id="SubscriptionTopic.trigger.canFilterBy.filterDefinition"></a>

## SubscriptionTopic.trigger.canFilterBy.filterDefinition
Canonical URL for a filterParameter definition

**Definition:** Either the canonical URL to a search parameter (like "http://hl7.org/fhir/SearchParameter/encounter-patient") or the officially-defined URI for a shared filter concept (like "http://example.org/concepts/shared-common-event").

**Comments:** Chained parameters are allowed (like "patient.gender") - but can not use colons or modifiers.

**Cardinality:** 0..1

**Type:** [uri](/uri)

**Summary:** true


<a id="SubscriptionTopic.trigger.canFilterBy.comparator"></a>

## SubscriptionTopic.trigger.canFilterBy.comparator
eq | ne | gt | lt | ge | le | sa | eb | ap

**Definition:** Comparators allowed for the filter parameter.

**Comments:** If no comparators are listed, clients should not expect servers to support any comparators.

**Cardinality:** 0..*

**Type:** [code](/code)

**Binding:** required:[search-comparator](/valueset-search-comparator)


<a id="SubscriptionTopic.trigger.canFilterBy.modifier"></a>

## SubscriptionTopic.trigger.canFilterBy.modifier
missing | exact | contains | not | text | in | not-in | below | above | type | identifier | of-type | code-text | text-advanced | iterate

**Definition:** Modifiers allowed for the filter parameter.

**Comments:** If no modifiers are listed, clients should not expect servers to support any modifiers.

**Cardinality:** 0..*

**Type:** [code](/code)

**Binding:** required:[search-modifier-code](/valueset-search-modifier-code)


<a id="SubscriptionTopic.trigger.notificationShape"></a>

## SubscriptionTopic.trigger.notificationShape
Properties for describing the shape of notifications generated by this trigger

**Definition:** List of properties to describe the shape (e.g., resources) included in notifications from this trigger.

**Cardinality:** 0..*

**Type:** [BackboneElement](/BackboneElement)

**Summary:** true

**Mappings:** rim=N/A (to add?)


<a id="SubscriptionTopic.trigger.notificationShape.resource"></a>

## SubscriptionTopic.trigger.notificationShape.resource
URL of the key definition that is the focus in a notification shape

**Definition:** URL of the Data Type, Resource, or definition (e.g., logical model) that is the type used in this shape. This is the 'focus' resource of the topic (or one of them if there are more than one) and the root for this shape definition. It will be the same, a generality, or a specificity of `SubscriptionTopic.trigger.resource` when it is present.

**Comments:** URL of the key definition that is the type used in this shape. Relative URLs are relative to the `StructureDefinition` root of the implemented FHIR version (e.g., http://hl7.org/fhir/StructureDefinition). For example, 'Patient' maps to http://hl7.org/fhir/StructureDefinition/Patient. For more information, see <a href="elementdefinition-definitions.html#ElementDefinition.type.code">ElementDefinition.type.code</a>.

**Cardinality:** 1..1

**Type:** [uri](/uri)

**Binding:** extensible:[subscription-types](/valueset-subscription-types)

**Summary:** true

**Mappings:** rim=N/A (to add?)


<a id="SubscriptionTopic.trigger.notificationShape.include"></a>

## SubscriptionTopic.trigger.notificationShape.include
Include directives, rooted in the resource for this shape

**Definition:** Search-style _include directives, rooted in the resource for this shape. Servers SHOULD include resources listed here, if they exist and the user is authorized to receive them.  Clients SHOULD be prepared to receive these additional resources, but SHALL function properly without them.

**Cardinality:** 0..*

**Type:** [string](/string)

**Summary:** true

**Mappings:** rim=N/A (to add?)


<a id="SubscriptionTopic.trigger.notificationShape.revInclude"></a>

## SubscriptionTopic.trigger.notificationShape.revInclude
Reverse include directives, rooted in the resource for this shape

**Definition:** Search-style _revinclude directives, rooted in the resource for this shape. Servers SHOULD include resources listed here, if they exist and the user is authorized to receive them.  Clients SHOULD be prepared to receive these additional resources, but SHALL function properly without them.

**Cardinality:** 0..*

**Type:** [string](/string)

**Summary:** true

**Mappings:** rim=N/A (to add?)


<a id="SubscriptionTopic.trigger.notificationShape.relatedQuery"></a>

## SubscriptionTopic.trigger.notificationShape.relatedQuery
Query describing data relevant to this notification

**Definition:** Queries and codes that could be included with notifications of this shape. Servers MAY include these queries if supported and desired in the workflow.

**Cardinality:** 0..*

**Type:** [BackboneElement](/BackboneElement)

**Summary:** true

**Mappings:** rim=N/A (to add?)


<a id="SubscriptionTopic.trigger.notificationShape.relatedQuery.queryType"></a>

## SubscriptionTopic.trigger.notificationShape.relatedQuery.queryType
Coded information describing the type of data this query provides

**Definition:** Coded value(s) used to describe the type of information that evaluating this query will provide. Subscribers can use the values to ensure the data they request are relevant and necessary for their use.

**Cardinality:** 0..1

**Type:** [Coding](/Coding)

**Summary:** true

**Mappings:** rim=N/A (to add?)


<a id="SubscriptionTopic.trigger.notificationShape.relatedQuery.query"></a>

## SubscriptionTopic.trigger.notificationShape.relatedQuery.query
Query to perform

**Definition:** Query a subscriber can use to retrieve additional information. The exact contents of the query MAY depend on the value of the `queryType`, however this SHOULD be a query suitable for use as an HTTP GET request (either fully-qualified or partial).

**Cardinality:** 1..1

**Type:** [string](/string)

**Summary:** true

**Mappings:** rim=N/A (to add?)